Use Travis for building

.gitignore

@@ -21,6 +21,9 @@
 !/yarn*
 !/.*ignore
 
+## Travis CI
+!/.travis.yml
+
 # Unwanted crap
 .DS_Store
 .DS_Store?

.travis.yml

@@ -0,0 +1,25 @@
+# Configuration
+sudo: false
+language: node_js
+
+node_js:
+    - "stable"
+
+# The install script
+install:
+    - yarn install
+
+# The pre-build script
+before_script:
+    - yarn run lint
+
+# The build script
+script:
+    - yarn run build
+
+# Disable email notifications
+notifications:
+    email: false
+
+# WHO IN THE F# (the programming language) DOESN’T SUPPORT TABS IN 2017? '	' <- tab
+# P.S.: F# (the programming language) also doesn’t support tabs, and that's terrible

README.md

@@ -1,3 +1,4 @@
+[![Build](https://travis-ci.com/ExE-Boss/app-menu.svg?branch=master)](https://travis-ci.com/ExE-Boss/app-menu)
 [![Mozilla Add-on](https://img.shields.io/amo/v/application-menu.svg)](https://addons.mozilla.org/firefox/addon/application-menu/)
 [![devDependencies](https://img.shields.io/david/dev/ExE-Boss/app-menu.svg)](https://david-dm.org/ExE-Boss/app-menu?type=dev)
 [![License](https://img.shields.io/github/license/ExE-Boss/app-menu.svg)](https://github.com/ExE-Boss/app-menu/blob/master/LICENSE)

gulpfile.js

@@ -6,6 +6,7 @@ const gulp	= require("gulp");
 const webExt	= require("web-ext").default;
 const mergeStream	= require("merge-stream");
 
+const eslint	= require("gulp-eslint");
 const jsonEdit	= require("gulp-json-editor");
 const pkgJson	= require("./package.json");
 
@@ -15,6 +16,14 @@ const BUILD_DIR 	= "./build/";
 const SOURCE_DIR	= "./src/";
 const ARCHIVES_DIR	= "./dist/";
 
+gulp.task("clean", () => {
+	try {
+		fse.emptyDirSync(BUILD_DIR);
+	} catch (e) {
+		console.error(e);
+	}
+});
+
 {
 	const build = () => {
 		return mergeStream(
@@ -31,12 +40,14 @@ const ARCHIVES_DIR	= "./dist/";
 	gulp.task("build-clean", ["clean"], build);
 }
 
-gulp.task("clean", () => {
-	try {
-		fse.emptyDirSync(BUILD_DIR);
-	} catch (e) {
-		console.error(e);
-	}
+gulp.task("lint", ["build-clean"], () => {
+	webExt.cmd.lint({
+		sourceDir:	BUILD_DIR
+	}, {shouldExitProgram: false});
+	return gulp.src(`${BUILD_DIR}**/*.js`)
+		.pipe(eslint())
+		.pipe(eslint.format())
+		.pipe(eslint.failAfterError());
 });
 
 gulp.task("dist", ["build-clean"], () => {

package.json

@@ -3,8 +3,9 @@
 	"version": "0.1.8a1",
 	"author": "ExE Boss",
 	"scripts": {
-		"build": "gulp build",
+		"build":	"gulp build",
 		"dist":	"gulp dist",
+		"lint":	"gulp lint",
 		"run":	"gulp run"
 	},
 	"repository": {
@@ -22,6 +23,7 @@
 		"fs-extra": "^6.0.1",
 		"gulp": "^3.9.1",
 		"gulp-cli": "^2.0.1",
+		"gulp-eslint": "^4.0.2",
 		"gulp-json-editor": "^2.4.1",
 		"merge-stream": "^1.0.1",
 		"stylelint": "^9.2.1",

yarn.lock

@@ -1626,7 +1626,7 @@ eslint-visitor-keys@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#3f3180fb2e291017716acb4c9d6d5b5c34a6a81d"
 
-[email protected], eslint@^4.19.1:
+[email protected], eslint@^4.0.0, eslint@^4.19.1:
   version "4.19.1"
   resolved "https://registry.yarnpkg.com/eslint/-/eslint-4.19.1.tgz#32d1d653e1d90408854bfb296f076ec7e186a300"
   dependencies:
@@ -2451,6 +2451,14 @@ gulp-cli@^2.0.1:
     v8flags "^3.0.1"
     yargs "^7.1.0"
 
+gulp-eslint@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/gulp-eslint/-/gulp-eslint-4.0.2.tgz#18a2a6768e4404cbf3e203239cb57474168fa606"
+  dependencies:
+    eslint "^4.0.0"
+    fancy-log "^1.3.2"
+    plugin-error "^1.0.0"
+
 gulp-json-editor@^2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/gulp-json-editor/-/gulp-json-editor-2.4.1.tgz#ef9dfcc7a29c664bdd0e992a331d2f1b0e64650d"
@@ -4386,7 +4394,7 @@ [email protected], pino@~4.16.1:
     quick-format-unescaped "^1.1.2"
     split2 "^2.2.0"
 
-plugin-error@^1.0.1:
+plugin-error@^1.0.0, plugin-error@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/plugin-error/-/plugin-error-1.0.1.tgz#77016bd8919d0ac377fdcdd0322328953ca5781c"
   dependencies: